For one circuit, the player might be given a selection of mid-range vehicles and in another given nothing but supercars to choose from. Win the indicated Stock Car race near the airstrip in Grand Senora Desert to unlock the corresponding vehicle in your garage. Land races can be off road or on road depending on the circuit, but the types of cars available will usually be similar in terms of performance. There are also certain events that mix types, letting the player choose a dirtbike for a primarily streetbike focused event. Bicycle races can cut through back alleys and parking lots, streetbike races usually take place on the roadways, and motorcross events of course take the racing off the beaten path. You can also collect the Cheval Marshall from Trevors.
Bike races can consist of bicycles, streetbikes, or motorcross bikes and ATVs, depending on the circuit chosen. Once unlocked, you can access the four stock cars from any of the characters personal garages.